Nozzle baffle



April 1961 F. J. MARSEE 2,980,408

NOZZLE BAFFLE Filed July 2, 1959 l M m I l6 //4 \j /0 w- M 38 [1 36 E 32 INVENTOR.

E5 fksam/c/(J/llxzksu United States Patent O NOZZLE BAFFLE Frederick J. Marsee, Hazel Park, Mich, assign'or to Holley Carburetor Company, Van Dyke, Mich, a corporation of Michigan Filed July 2, 1959, Ser. No. 824,742

3 Claims. (Cl. 261-61) This invention relates generally to carbureting devices for internal combustion engines, and more specifically to those carbureting devices having a choke valve therein for at times restricting the flow of air to said engine.

Some of the present carburetors are restricted dimensionally to overall maximum heights which are dictated by the size of the engine compartment. As a result of this, these carburetors usually have dimensional interference between the choke valve and the main fuel nozzle during periods in which the choke valve is fully open.

In the past, it has been the accepted practice to provide an opening within the choke valve, such as a slot, which would permit the main fuel nozzle to pass through the choke valve as the valve moved to its fully opened position. In this manner the interference was removed.

However, as a result of the opening so provided, proper regulation of the richness of the combustible mixture by the choke valve is substantially diminished. That is, during periods of choke closure, the vacuum which would normally exist posterior to the choke valve and which is applied to the main metering systems materially reduced by the unrestricted flow of air through the opening formed within the choke valve.

Accordingly, it is an object of this invention to provide means adapted to coact with the choke valve in a manner so as to maintain a relatively high vacuum posterior to the choke valve during periods of choke closure and yet not interfere with the proper choke opening movements.

Other more specific objects and advantages will become apparent when reference is made to the accompanying written specification and the attached drawings, wherein:

Figure l is an elevational view of a carburetor partially in cross-section illustrating the preferred embodiment of the invention, with the carburetor being shown mounted on the engine intake manifold.

Figure 2 is a fragmentary cross-sectional view taken on line 22 of Figure l and looking in the direction of the arrows. The choke valve is shown in its partially opened position.

Figure 3 is a view similar to that of Figure 2, but illustrating the choke valve in its fully opened position.

Referring now in greater detail to the drawings, Figure 1 illustrates a carburetor having a body 12 with an induction passage 14 therethrough. A choke valve 16 is mounted within the induction passage on a shaft 18 generally anterior to the main fuel nozzle 30. A throttle valve 20, adapted to control the discharge of combustible mixtures into the intake manifold 22, is located Within the induction passage 14 posterior to the main fuel nozzle 30.

A fuel reservoir illustrated generally at 24 supplies fuel to a conventional idle fuel system (not shown) and to the main fuel metering system by a metering restriction 26, conduit 28 and a main fuel nozzle 30. Air bleeds, such as bleed 34, may of course be provided in order to create a proper fuel-air emulsion within the conduit 28.

The choke valve 16, which is adapted to be rotated 7 2,939,498 Patented Apr, 18, i fil ICC either manually or automatically, by shaft 18, has a slot 32 formed therein so as to provide a clearance which is sufficient to receive the main fuel nozzle 30 when the choke valve is fully opened, as shown in Figure 3. A bafiie member 36, preferably formed so as to substantially overlap the slot 32, is secured in any suitable manner, as by screw 38, to the choke valve 16. The bafile 36 is thus adapted to be rotated with the choke valve.

Referring to both Figures 2 and 3, it can be seen that the bafiie plate 36 may be formed so as to be displaced some substantial distance away from the choke valve 16 and that this distance is basically a function of the size of the main nozzle 30.

Referring in greater detail to Figure 2, it becomes evident that if the bafiie membm 36 were not provided, the air flow through the slot 32 would be such as to cause air currents in close proximity to the nozzle 30. These air currents would, in turn, cause the area generally surrounding the nozzle 30 to approach atmospheric pressure and nullify the force of the vacuum tending to draw fuel out of the nozzle 30. The provision of the baifle plate 36 prevents these undesirable air currents, and as illus trated by the arrows, causes the air to be deflected around the entire choke valve, thereby allowing the nozzle 30 to remain exposed to an area which is affected by vacuum.

Although only one embodiment of the invention has been disclosed and described, it is apparent that other modifications are possible within the scope of the appended claims.

What I claim as my invention is:

l. A carbureting device adapted to be mounted on the intake manifold of an internal combustion engine, comprising a body, an induction passage formed through said body and in communication with said intake manifold, a main fuel nozzle adapted to at times discharge fuel into said induction passage, a throttle valve in said induction passage adapted to control the flow ofcombustible mixtures to said intake manifold, a choke valve, a pivotal support for said choke valve located anterior to said main fuel nozzle, an opening formed within said choke valve in order to receive said main fuel nozzle when said choke valve is in its fully open position, and bafiie means operatively connected to said choke valve for inhibiting the free flow of air currents through said opening.

2. A carbureting device adapted to be mounted on the intake manifold of an internal combustion engine, comprising a body, an induction passage formed through said body and in communication with said intake manifold, a main fuel nozzle adapted to at times discharge fuel into said induction passage, a throttle valve in said induction passage adapted to control the flow of combustible mixtures to said intake manifold, a choke valve, a pivotal support for said choke valve located anterior to said main fuel nozzle, an opening formed within said choke valve in order to receive said main fuel nozzle when said choke valve is in its fully open position, and baffle means connected to said choke valve at a point anterior of said choke valve when said choke valve is in a substantially closed position for inhibiting the free flow of air currents through said opening.

3. A carbureting device adapted to be mounted on the intake manifold of an internal combustion engine, comprising a body, an induction passage formed through said body and in communication with said intake manifold, a main fuel nonle projecting into said induction passage adapted to at times discharge fuel into said induction passage, a throttle valve in said induction passage adapted to control the flow of combustible mixtures to said intake manifold, a choke valve, a pivotal support for said choke valve located anterior to said main fuel nozzle and projecting into said induction passage substantially fiarallel to said main fuel nozzle, an oppmng formed fithkefefehce i ted ii the file atent 1n sa1d' choke valve adapted to re celve sald mam fuel UNITED STATES PATENTS nozzle when sa1d choke valve 1s m Its fully open POSIHOII, V I V and bafije means cp erativelyconnected to said valvq far 0 F'Q y 1940 inhibiting the free flow of air currefits thm'gigh said 5 2,457,570 Lelbmg D 28, 1948 opening. 2,538,569 Kittler et a1 Jan. 16, 195 

